US4901479A - Portable hand machine tool, particularly angle gringer - Google Patents

Portable hand machine tool, particularly angle gringer Download PDF

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Publication number
US4901479A
US4901479A US07/343,143 US34314389A US4901479A US 4901479 A US4901479 A US 4901479A US 34314389 A US34314389 A US 34314389A US 4901479 A US4901479 A US 4901479A
Authority
US
United States
Prior art keywords
drive shaft
wedge
spindle
machine tool
hand machine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/343,143
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English (en)
Inventor
Winfried Helm
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Assigned to ROBERT BOSCH GMBH, A LIMITED LIABILITY COMPANY OF GERMANY reassignment ROBERT BOSCH GMBH, A LIMITED LIABILITY COMPANY OF GERMANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HELM, WINFRIED
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Application granted granted Critical
Publication of US4901479A publication Critical patent/US4901479A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B45/00—Means for securing grinding wheels on rotary arbors
    • B24B45/006—Quick mount and release means for disc-like wheels, e.g. on power tools
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00—Chucks or sockets
    • Y10T279/17—Socket type
    • Y10T279/17923—Transverse pin
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9372—Rotatable type
    • Y10T83/9377—Mounting of tool about rod-type shaft
    • Y10T83/9379—At end of shaft

Definitions

  • the invention relates to a portable hand machine tool, particularly an angle grinder.
  • a portable hand machine tool is known (EP-OS No. 152,564) in which a slide element is supported for transverse sliding along guide means in the housing and has an inclined surface acting on an axial flange surface of the spindle during the transverse sliding.
  • the spindle is then slid axially relative to the drive shaft together with a screwed-on spindle nut so far that an axial slackening of the clamp nut then occurs, whereupon the clamp nut can be unscrewed fully by hand without the need for additional tools.
  • an axial spring is inserted between the spindle and the drive shaft.
  • the spring forces the spindle in the opposite direction into an initial position defined by an axial stop when the slide element is inoperative.
  • the clamp nut tightens further spontaneously during the operation of the hand machine tool. It is therefore necessary for the spring to have an extraordinary rigidity in order to ensure this tightening and the firm seat of the clamp tool with certainty. If the spindle is to be slid axially relative to the drive shaft for slackening without using an additional tool and release of the clamp nut, by a transverse sliding of the slide element, then it is necessary for the inclined surface of the latter to exert an additional axial force which enables the slackening by compressing the axial spring. Sliding of the slide element, therefore, requires application of a considerable force, which makes the manipulation considerably more difficult and can generally actually be applied only with the assistance of additional auxiliary tools.
  • the object of the invention is to provide a portable hand machine tool, particularly an angle grinder in which tool exchange without using an additional tool is possible without danger of damaging the motor and/or mutually engaged surfaces of the slider and the spindle.
  • the object of the invention is achieved by forming the slide element as a wedge coupled to the drive shaft and the spindle for joint rotation therewith. Because the wedge is coupled to the drive shaft and to the spindle and rotates in common with both, and hence the inclined surface of the wedge on the one hand and the wedge surfaces of both parts cooperating with the latter on the other hand rotate in common, the problem of possible incorrect operation with damage to the motor and to said mutually engaged surfaces does not arise.
  • the wedge constitutes a torque-transmitting coupling between drive shaft and spindle, so that no further shaped surfaces are necessary for a positive engagement with torque transmission between the two. This reduces the outlay and costs for it.
  • the wedge Because the wedge is located between drive shaft and spindle, coupling the two, it can be slid, in order to slide the spindle with screwed-on clamp nut in the release direction, relatively fast and simply and be exerting only a weak force in the direction of the inclined surface and the wedge surface acting with the latter. No particular and major exertion of force is required for this purpose.
  • the hand machine tool permits an exchange of grinding wheels without any auxiliary tool, which can moreover be performed fast and reliably. It is also advantageous that already existing hand machine tools of the generic type can also be modified to include the features according to the invention. Despite all this, the hand machine tool is simple and inexpensive. Parts already used hitherto, standardized in some cases, are still used as far as possible, the standardized clamp nut in particular.
  • FIG. 1 shows a partial longitudinal cross-sectional view of an angle grinder with clamped grinding wheel, according to the present invention.
  • FIG. 2 shows a cross-sectional view of components of the angle grinder shown in FIG. 1 in the unclamped state for exchanging the grinding wheel.
  • FIGS. 1 and 2 A portable hand machine tool constructed as an angle grinder 10 is shown in FIGS. 1 and 2 and contains a motor, not shown, which drives an internally hollow drive shaft 13 through an angle drive 11, on which a bevel drive 12 is visible.
  • the bevel gear 12 is mounted on the drive shaft 13.
  • the latter is rotatably supported in the housing 16 by a needle bearing 14 at the upper end and of a ball bearing 15 in the lower end region.
  • the drive shaft 13 serves to drive a tool 17, which consists of the indicated grinding wheel for example, or of another tool wheel, a rubber disc or the like.
  • the tool 17 is clamped and tensioned between a counterflange 18 and a clamp nut 19.
  • the counterflange 18 is mounted as shown in FIGS. 1 and 2, on the lower end of the drive shaft 13 upon which it is centred.
  • the counterflange 18 has an axial surface 20, against the facing end surface 21 of the drive shaft 13.
  • a spindle 22 is located within the drive shaft 13 extends through the drive shaft 13 along its total length starting from the region of the needle bearing 14, and has a cylindrical shoulder that extends into the counterflange 18.
  • the cylindrical shoulder 23 has a relative mobility and an end threaded section 24 adjacent to the latter, for receiving thereonto the clamp nut 19.
  • the spindle 22 is coupled to the drive shaft 13 to transmit torque. This is done by positive engagement.
  • the drive shaft 13 contains at its lower end region inner shaped surfaces 25, two sided surfaces or multi-sided surfaces for example.
  • the spindle 22 has outer shaped surfaces 26, two or multi-sided surfaces, for example, in the axial region associated with the shaped surfaces 25.
  • the shaped surfaces 25 and 26 are mutually in mesh to transmit a torque.
  • the arrangement is made so that the spindle 22 together with the screwed-on clamp nut 19 is slidable axially at least within limits relative to the hollow drive shaft 13, the torque-transmitting coupling being maintained.
  • a slide element 27 is also arranged in the housing 16 and is provided with an inclined surface 28 and can be slid transversely to the longitudinal central axis of the spindle 22 to effect an axial sliding of the spindle 22 together with the screwed-on clamp nut 19 relative to the drive shaft 13 and thus to achieve an axial slackening by at least slight lifting of the clamp nut 19.
  • the slide element 27 is formed by a wedge 29 which is coupled to the drive shaft 13 and to the spindle 22 and rotates with both when the motor is switched on. The wedge 29 penetrates the drive shaft 13 and the spindle 22 transversely. In doing so it likewise constitutes a torque-transmitting element between the two, so that it is not strictly necessary to maintain the shaped surfaces 25 and 26 in mesh.
  • the inclined surface 28 of the wedge 29 is located on the side which faces the counterflange 18.
  • the wedge 29 is mounted by this inclined surface 28 upon a corresponding wedge surface 30 of the drive shaft 13, which extends on both sides of the wedge 29.
  • the wedge 29 is slidable, at least in limits, on said wedge surface 30.
  • the slope angle of the inclined surface 28 and of the wedge surface 30 is dimensioned so that self-locking occurs between them.
  • the wedge 29 has, on its other side opposite the inclined surface 28 and remote from the counter flange 18 a straight surface 31 which extends within a diametral plane transverse to the drive shaft 13 and spindle 22.
  • the drive shaft 22 contains, to receive and guide the wedge 29, a transversely oriented aperture which is delimited downwards in FIGS. 1 and 2 by the wedge surface 30 and is delimited on the opposite side, at the height of the straight surface 31 of the wedge 29, by an upper linear surface 32 extending in a diametral plane.
  • the spindle 22 is provided with a transverse passage penetrated by the wedge 29, having an upper linear surface 33 oriented within a diametral plane and a lower wedge surface 34.
  • the drive shaft 13 carries, fixed on it, an outer ring 35.
  • the wedge 29 is retained and guided in the ring 35 by at least one end projecting beyond the drive shaft 13 in the transverse direction.
  • a spring 36 constructed as a compression spring is retained within the ring 35, is centered on an end shoulder 37 of the wedge 29 and engages the wedge 29 there.
  • the spring 36 exerts a force on the wedge 29 in the rising direction of the inclined surface 24 and wedge surfaces 30, 34 and has a tendency to push the wedge 29 from right to left in FIGS. 1 and 2.
  • the device described for fastening the tool 17 permits an exchange of the tool 17 without any additional tools.
  • the tool exchange is therefore considerably simplified. It can be performed rapidly and reliably.
  • the clamping flange 18 can be shaped conventionally and can therefore be adopted.
  • the clamp nut 19 also conforms to the standard and can be adopted unchanged in its previous construction without special adaptations.
  • the counterflange 18 may also be integral constituent of the drive shaft 13 and therefore form a non-rotatable positive engagement with the latter, so that any possible relevant regulations may also be met.
  • the clamp nut 19 is unmodified and therefore remains as standard, that is to say still contains the stud holes in the flange and therefore also permits the engagement of a special tool, in the form of a two-hole nut wrench for example, here again it is possible in particularly obstinate cases, of a rusted-on clamp nut 19 for example, to apply said spanner in customary manner and to slacken the clamp nut 19 with it.
US07/343,143 1986-12-10 1989-11-28 Portable hand machine tool, particularly angle gringer Expired - Fee Related US4901479A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3642153 1986-12-10
DE19863642153 DE3642153A1 (de) 1986-12-10 1986-12-10 Tragbare handwerkzeugmaschine, insbesondere winkelschleifer

Publications (1)

Publication Number Publication Date
US4901479A true US4901479A (en) 1990-02-20

Family

ID=6315871

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/343,143 Expired - Fee Related US4901479A (en) 1986-12-10 1989-11-28 Portable hand machine tool, particularly angle gringer

Country Status (7)

Country Link
US (1) US4901479A (ja)
EP (1) EP0333731A1 (ja)
JP (1) JPH02501547A (ja)
BR (1) BR8707911A (ja)
DE (1) DE3642153A1 (ja)
ES (1) ES2008380A6 (ja)
WO (1) WO1988004219A1 (ja)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4989374A (en) * 1987-12-08 1991-02-05 C. & E. Fein Gmbh & Co. Portable machine tool with automatic locking of the work spindle
US5259145A (en) * 1991-05-22 1993-11-09 Makita Corporation Clamp device for rotary tool element
US5425666A (en) * 1992-10-07 1995-06-20 Robert Bosch Gmbh Eccentric disk grinder
US5778751A (en) * 1993-03-08 1998-07-14 Tokyo Seimitsu Co., Ltd Mounting structure for cutting blade of dicing apparatus
US5964006A (en) * 1997-01-13 1999-10-12 3M Innovative Properties Company Rotary surface treatment tool
US6410438B1 (en) * 1998-08-09 2002-06-25 Emutech Co., Ltd. Method and device for polishing work edge
US20070074612A1 (en) * 2005-10-04 2007-04-05 Ben Yu Worktable having adjustable shield
US20090136310A1 (en) * 2007-11-28 2009-05-28 Michael Naughton Cutting tool assembly including a release mechanism
EP2147747A1 (de) 2008-07-23 2010-01-27 Metabowerke Gmbh Handwerkzeuggerät
US20110039482A1 (en) * 2009-07-29 2011-02-17 Terry Timmons Grinder
CN102029564A (zh) * 2009-10-05 2011-04-27 杨泰和 马达平行传动的手持转角砂轮机
US20130270780A1 (en) * 2012-04-17 2013-10-17 Alain Erni Power Tool With A Clamping Mechanism For Clamping A Tool

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT403445B (de) * 1993-07-22 1998-02-25 Ringhofer Ewald Vorrichtung zum lösen und gegebenenfalls zum befestigen einer trenn- oder schleifscheibe
US6031253A (en) * 1997-09-30 2000-02-29 Kyocera Corporation Package for housing photosemiconductor device
JP4734016B2 (ja) * 2005-04-20 2011-07-27 株式会社マキタ 電動工具
ITPR20090034A1 (it) * 2009-05-07 2010-11-08 Giovanni Ficai Sistema di accoppiamento rapido di un disco abrasivo all'albero ruotante di una macchina smerigliatrice portatile
JP2013043262A (ja) * 2011-08-25 2013-03-04 Makita Corp グラインダ

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2667687A (en) * 1950-12-04 1954-02-02 Clarkson Frank Henry Toolholder

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1389906A (fr) * 1964-04-01 1965-02-19 Mandrin porte-outil
EP0152564B1 (de) * 1984-02-18 1989-08-23 C. & E. FEIN GmbH & Co. Werkzeugbefestigung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2667687A (en) * 1950-12-04 1954-02-02 Clarkson Frank Henry Toolholder

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Europaeische Patentanmeldung 0 152 564/Werkzeugbefestigung. *

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4989374A (en) * 1987-12-08 1991-02-05 C. & E. Fein Gmbh & Co. Portable machine tool with automatic locking of the work spindle
US5259145A (en) * 1991-05-22 1993-11-09 Makita Corporation Clamp device for rotary tool element
US5425666A (en) * 1992-10-07 1995-06-20 Robert Bosch Gmbh Eccentric disk grinder
US5778751A (en) * 1993-03-08 1998-07-14 Tokyo Seimitsu Co., Ltd Mounting structure for cutting blade of dicing apparatus
US5964006A (en) * 1997-01-13 1999-10-12 3M Innovative Properties Company Rotary surface treatment tool
US6138317A (en) * 1997-01-13 2000-10-31 3M Innovative Properties Company Rotary surface treatment tool
US6410438B1 (en) * 1998-08-09 2002-06-25 Emutech Co., Ltd. Method and device for polishing work edge
US7458301B2 (en) * 2005-10-04 2008-12-02 Ben Yu Worktable having adjustable shield
US20070074612A1 (en) * 2005-10-04 2007-04-05 Ben Yu Worktable having adjustable shield
US20090136310A1 (en) * 2007-11-28 2009-05-28 Michael Naughton Cutting tool assembly including a release mechanism
US8328475B2 (en) 2007-11-28 2012-12-11 Milwaukee Electric Tool Corporation Cutting tool assembly including a release mechanism
EP2147747A1 (de) 2008-07-23 2010-01-27 Metabowerke Gmbh Handwerkzeuggerät
US20110039482A1 (en) * 2009-07-29 2011-02-17 Terry Timmons Grinder
CN102029564A (zh) * 2009-10-05 2011-04-27 杨泰和 马达平行传动的手持转角砂轮机
US20130270780A1 (en) * 2012-04-17 2013-10-17 Alain Erni Power Tool With A Clamping Mechanism For Clamping A Tool
US9339904B2 (en) * 2012-04-17 2016-05-17 C. & E. Fein Gmbh Power tool with a clamping mechanism for clamping a tool

Also Published As

Publication number Publication date
JPH02501547A (ja) 1990-05-31
DE3642153A1 (de) 1988-06-23
BR8707911A (pt) 1989-10-03
EP0333731A1 (de) 1989-09-27
WO1988004219A1 (fr) 1988-06-16
ES2008380A6 (es) 1989-07-16

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AS Assignment

Owner name: ROBERT BOSCH GMBH, POSTFACH 10 60 50, D-7000 STUTT

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:HELM, WINFRIED;REEL/FRAME:005085/0574

Effective date: 19890222

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Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
FP Lapsed due to failure to pay maintenance fee

Effective date: 19930220

STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362